For groovy : change syntax to Java .. make  sure you have ; so it becomes like java. I myself always adding ; on each line of code.

after that 

ESC gg = SHIFT-G 

means:
1. ESC --> back to mode
2. gg  --> go to first line 
3. =   --> indenting 
4. SHIFT G --> to end of file. 

for spesific lines 

ESC SHIFT V (select the lines) press = 

SHIFT V = enter visual mode then you can select which lines you want to format
after that pressing = will format the code

www.wysmedia.com

how to "beautify" or tidying your code using vim ?

vim: code formatting

groovy

Groovy